Red Hat Bugzilla – Bug 7785
ping -c 1 does not exit after 1 packet sent
Last modified: 2016-03-10 11:54:24 EST
Many packages use ping to test to see if a machine is alive. The ping -c 1 hostname is executed and the return code checked. Normally this command would send out 1 packet , wait to see if it returns, and exit after the wait time since its only to send 1 packet. This command is not exiting - it is continueing to send packets and never exiting. WHen the command is given a ctrl-c at the command line it then indicates it has sent more than the proper number of packets. [root@stealth /root]# ping -c 1 cad609 PING cad609.cad.dehavilland.ca (134.31.80.236) from 134.31.40.45 : 56(84) bytes of data. --- cad609.cad.dehavilland.ca ping statistics --- 3 packets transmitted, 0 packets received, 100% packet loss [root@stealth /root]# The command above was given a ctrl-c after about 20 seconds....
I have also come to the same conclusion. I run several Big Brother Server on various platforms (Solaris 2.5.1 SPARC) and RedHat 5.2 i386. I set up a BigBrother server on RedHat 6.0 i386 at another company and it ran for a few days without any apparent problems until a router went down for a very short period of time. The "ping -c 1 xxx.xxx.xxx.xxx" never returned control and everything went purple until the box was rebooted. I worked on this for a few days before figuring out exactly where the problem was. In addition I can not seem to "traceroute xxx.xxx.xxx.xxx" to any of the router interfaces (it will traceroute to a server behind the remote routers, a Windows machine on the same hub can traceroute to the routers just fine. I upgraded to RedHat 6.1 and the same problem exists. I even compiled and installed "fping" but it has the same problem so I assume it is an underlying problem with a library or the kernel. My next step is to install Mandrake or some other package (or even RedHat 5.2 which might be the better choice as I have had no trouble with it at the other location). This bug list is the first time I've seen any other references to the problem (other than someone on the Big Brother mailing list mentioned it in one message). Thanks, Todd
In fact, try this: "ping -c 1 12.10.0.6". I don't know who's address it is but you certainly can duplicate that ping does not return (I just picked an address out of the air and just so happened exhibited the problem).
*** This bug has been marked as a duplicate of 8724 ***
Commit pushed to master at https://github.com/openshift/origin https://github.com/openshift/origin/commit/1df7eccd4c62b7cd1639202fac9c73b3cb40bc7d Merge pull request #7794 from soltysh/issue7785 Merged by openshift-bot